Waraluk Tangkanakul และ Nuntavarn Vichit-Vadakan. (2000) The prevalence and risk ratio of patients suspected of having leptospirosis. Chulalongkorn University:ม.ป.ท.Waraluk Tangkanakul และ Nuntavarn Vichit-Vadakan. 2000. The prevalence and risk ratio of patients suspected of having leptospirosis. ม.ป.ท.:Chulalongkorn University;Waraluk Tangkanakul และ Nuntavarn Vichit-Vadakan. The prevalence and risk ratio of patients suspected of having leptospirosis. ม.ป.ท.:Chulalongkorn University, 2000. Print.